The ALICE detector [1]} is specifically designed to study heavy-ion collisions. The central barrel comprising the two main tracking detectors, the Inner Tracking System (ITS) [2]} and the Time Projection Chamber (TPC) [3]} is housed in a large solenoidal magnet providing a 0.5 T field. The detector pseudorapidity coverage is \(\vert \eta \vert \le \)  0.9 over the full azimuth. An additional part of the central barrel are detectors in forward direction used mainly for triggering and centrality selection.
The VZERO detectors, two scintillation hodoscopes, are placed on either side of the interaction point and cover the pseudorapidity regions of \(2.8<\eta <5.1\)  and \(-3.7<\eta <-1.7\) . The centrality selection is based on the sum of the amplitudes measured in both detectors as described in [4]} and [5]}.
